English old gold coin one has for giving a lesson (9)

I believe the answer is:

educative

'giving a lesson' is the definition.
(for education)

'english old gold coin one has' is the wordplay.
'english' becomes 'e' (abbreviation).
'old gold coin' becomes 'ducat' (old European coin).
'one has' becomes 'I've' (contraction of I have).
'e'+'ducat'+'ive'='EDUCATIVE'

'for' is the link.

(Another definition for educative that I've seen is " Relating to teaching".)

I've seen this clue in The Guardian.

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